(02.01 MC)
Observe the image. What observable property can be used to separate a mixture of sand and rice using this tool? (2 points)
Public Domain
Oa
Color
Ob
Magnetic attraction
oc
Particle size
Od
Texture
8.69 Mostly cl

Answer:

Explanation: because more is always better

x21 +ANSWER

(i) Ne-22

(ii)1s2s22p6

(iii)21.3

An element X exists in three forms A, B and C in the ratio 1:2:3. If C has 10 protons and the number of neutrons in A, B and C are 10, 11 and 12 respectively,Give the following:(i) Representation of form C of the element X(ii) Electronic configuration of form B of the element(iii) Calculate the average atomic mass.

(i)C  has 10 protons and 12 neutrons so a mass of 10 +12 =22

element 10 is Neon (Ne) so this isotope is Ne-22

(ii) they all have the sane atomic number so the same number of electrons

with an electronic structure of 1s2s22p6

(iii) A weighs 20, B weighs 21, C weighs 22

the ratio is 1:2:3

weighted average weight is therefor

(1X20 +2X21 +3X22)/6 =21.3

Answer:

1

all matter is made of tiny particles called atom

Answer:

I think that it it correctly balanced that is my opinion and, because  the way it is set up, that the answer will tell you weather or not it is correctly balanced or not.

Evaluating the number of atoms of each element on the product and reactant side, we can conclude that the student's equation isn't balanced.

Given the chemical reaction :

[tex] Al_{4}C_{3} + 6H_{2}O ---> 3CH_{4} + 4Al(OH)_{3} [/tex]

For a balanced equation, the number of atoms of each element in the product side must be equal to that on the reactant side.

Number of hydrogen :

Reactant side = (6 × 2) = 12

Product side = (6 × 2) + (6 × 2) = 12 + 24 = 24

Product side ≠ reactant side ; Hence, the equation isn't balanced

The balanced equation for the reaction goes thus :

[tex] Al_{4}C_{3} + 12H_{2}O ---> 3CH_{4} + 4Al(OH)_{3} [/tex]

Reactant side :

Al = 4

H = (12 × 2) = 24

O = 12

C = 3

Product side :

H = (6 × 2) + (6 × 2) = 12 + 24 = 24

Al = 4

O = 4 × 3 = 12

C = 3

Therefore, the student's equation isn't balanced, the balanced version of the equation has been given .

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Answer:

The major difference between atomic number and mass number is that the atomic number states the number of protons present in an atom whereas, the mass number indicates the total of the number of protons and the number neutrons present in an atom.

Explanation:

Answer:

4

Explanation:

There are 4 significant figures because when there is not a decimal, then only numerical values over 0 are counted. So the numbers counted in sig figs are 2049, and none of the other 0s.

So if it was 204,900,000,000.0, then it would have 12 significant figures.

Answer:

the position of hydrogen is controversial in periodic table because hydrogen is the only element with out neutron. it belongs to 1 st group but it is not placed there .

Explanation:

C4H9OH is the substrate, Br- is the nucleophile and H2O is the leaving group.

In an SN1 reaction, the rate limiting step is the formation of the carbocation. The carbocation is formed as water which is the leaving group departs. After the leaving group departs, the nucleophile (Br-) attacks to yield the major organic product. The protonation of the -OH group  is the first step in the reaction.

It then follows that, C4H9OH is the substrate, Br- is the nucleophile and H2O is the leaving group.

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Answer:

45 grams

Explanation:

Answer:

Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other carbon atoms. A lot of energy is needed to separate the atoms in diamond. This is because covalent bonds are strong, and diamond contains very many covalent bonds.

Graphite on the other hand has flat layers of carbon atoms held by weak van der Waal's forces which makes Graphite a weak object and easily breakable.

As graphite contains layers of carbon atoms. The layers slide over each other easily because there are only weak forces between them, making graphite slippery. These electrons can move through the graphite, carrying charge from place to place and allowing graphite to conduct electricity.One valence electron of each carbon atom remains free, Thus making graphite a good conductor of electricity. Whereas in diamond, they have no free mobile electron. Hence there won't be flow of electrons That is the reason behind diamond are bad conductor electricity.These electrons are free to move between the layers in graphite, so graphite can conduct electricity.The forces between the layers in graphite are weak. This means that the layers can slide over each other.

Answer:

I believe Cobalt is a Transition Metal.

Answer:

answer is transition metal

Answer:

5 what

Explanation:

not enough information

Answer:

55.845

Explanation:

yep

Answer:

The temperature is the same overtime.

Explanation:

Since the line on the graph is straight the temperature will be constant.

Explanation: The additional terminology comes from the definition that, within redox processes, a reductant transfers electrons to an oxidant; hence, the reductant (reducing agent) loses electrons, so is oxidized, while the oxidant (oxidizing agent) gains electrons, so is reduced.

In an oxidation-reduction reaction, the reducing agent loses electrons and loses potential energy, Therefore, option (C) is correct.

A substance that loses its electrons in a redox reaction to other substances and gets oxidized is called a reducing agent. A reducing agent is one of the reactants which reduces the other reactant by donating the electrons to the reactant of an oxidation-reduction reaction.

If the reducing agent can't pass electrons to another reactant in a reaction, then the reduction process does not occur and the reaction cannot proceed.

In redox reactions, when an electron loses potential energy as a result of the transfer and energy is released. Electrons with more potential energy are associated with less electronegative atoms and less potential energy is associated with a more electronegative atom (such as O).

Therefore, the reducing agent loses electrons and loses potential energy in a redox reaction.

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Your question is incomplete, but probably the complete question was,

In an oxidation-reduction reaction, how is the reducing agent changed?

(A) it gains electrons and gains potential energy

B) it gains electrons and loses potential energy

C) it loses electrons and loses potential energy

D) it loses electrons and gains potential energy

Answer:

159.808 g/mol

Answer:

159.80 g/mol

Explanation:

79.90×2=159.80g/mol

Answer:

2689.4

Explanation:

Answer:

A

Explanation:

Because it is the greatest

Answer:

the law of multiple proportions, law of definite proportions, and law of conservation of mass.

Explanation:

(Hope this helps can I pls have brainlist (crown)☺️)

Answer:

Carbon Monoxide- D)

Nitrogen Oxides- A)

Particulate matter- C)

Sulfur Oxides- B)

Explanation:

Answer is 100% verified

Count on me, I'm a Chemistry Guru

Answer:

Krypton is the element

Symbol: Kr

Answer:

b or d

Explanation:

Answer:

The answer is B (it's reactivity)

Answer:

1st blank : Atoms

2nd blank : Reactants

I'm still trying to find the 3rd blank. I'll put it in comments if I find it

Explanation:

Hope this helps :)

Pls make brainliest :}

And have an amazing day <3

To determine the shapes of molecules, we must become acquainted with the Lewis electron dot structure. Although the Lewis theory does not determine the shapes of molecules, it is the first step in predicting shapes of molecules. The Lewis structure helps us identify the bond pairs and the lone pairs.

Please mark BRAINLIEST.

Answer:

Ionic

Explanation:

Na is a metal and Br is a non-metal. Makes an ionic bond. Hope that helps

Answer:

1g Hydrogen

Explanation:

Calcium in water reacts vigorously to give a cloudy white Precipitate (compound) called Calcium hydroxide alongwith the evolution of Hydrogen gas.

[tex] \boxed{ \mathsf{Ca + H_2O \rightarrow Ca(OH)_2 + H_2}}[/tex]

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

This reaction is not in it's balanced form! The number of atoms of Hydrogen on the left is 2 while that on the right is 4,I.e.,they're not equal.

Adding a 2 in front of H2O solves the problem by making the number of atoms of each element on both the sides equal.

[tex] \mathsf{Ca +2 H_2O \rightarrow Ca(OH)_2 + H_2}[/tex]

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Looking into the equation more carefully, we see:

1 atom of Calcium reacts with 2 molecules of water to give 1 molecule of Calcium Hydroxide alongwith 1 molecule of Hydrogen gas.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Mass of one atom of Calcium = it's gram atomic mass

= 40 g

Mass of one "molecule" of Hydrogen

= it's Gram molecular mass

= gram mass of one atom × number of atoms in one molecule

= 1 × 2

= 2 g

So,

according to our observation:

One atoms of Calcium gives one molecule of Hydrogen (during the particular reaction)

=> 40g of Calcium gives = 2g of Hydrogen

•°• 1 g of Calcium gives = [tex] \frac{2}{40} [/tex]

= [tex] \frac{1}{20} [/tex] g Hydrogen

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

We're provided with 20g of Calcium,

=> 20g of Calcium gives = 20 × [tex] \frac{1}{20} [/tex] g H2

= 1 g H2

_______________

Hope this helps!

Answer:

C. Tightly packed protons and neutrons

Explanation:

It consists of two sub-atomic particle namely proton and neutron.

This dense nucleus is responsible for most of the mass of atom.

Answer:

C. tightly packed protons and neutrons

Explanation:

The nucleus of an atom is made of protons and neutrons with electrons orbiting the nucleus.

Answer:

It is a water molecule.

Explanation:

A water molecule consists of two atoms of hydrogen linked by covalent bonds to the same atom of oxygen. Atoms of oxygen are electronegative and attract the shared electrons in their covalent bonds.

Answer:

A water molecule is an example of a molecule created through covalent bonding. Water is made up of one oxygen atom and 2 hydrogen atoms, hence the chemical symbol H2O. A hydrogen atom is made up of 1 proton at its core and 1 electron that revolves around the core in a three-dimensional orbit.

Explanation:

Answer:

Explanation:

D

An object’s speed is determined by the distance the object traveled, how long it took the object to travel that distance, and what direction the object traveled. This statement is correct regarding the speed and velocity of an object.

The directional speed of an item in motion, as measured by a specific unit of time and viewed from a certain point of reference, is what is referred to as velocity.

Velocity is the pace and direction of an item's movement, whereas speed is the time rate at which an object is travelling along a route.

Constant acceleration and constant velocity are both forms of motion, as you have already read. Because acceleration is the rate at which velocity changes, constant velocity and constant acceleration go hand in hand.

Thus, option D is correct.

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